Chronometer



W. A. SLlNGER-LAND.

CHRONOMETER.

APPLICATION FILED APR. 15, 1919.

Patented Oct. 25, 1921.

2 SHEETSSHEE1 I.

Int enter. W Zmyerland W. A. SLINGERLAND.

CHRONOMETER. APPLICATION FILED APR 15. I919- Patented 001;. 25, 1921 2 SHEETS-SHEET 2.

/IIIIIII Inventor? W [1 Q cslz'n 'erlan WILLIAM A. SLINGERLAND, OF PORTLAND, OREGON.

CHRONOMETER.

Application filed April 15, 1919.

To all whom it may concern Be it known that I, VVILLIAM A. SLINGER- LAND, a native-born citizen of the United States, residing at Portland, in the county of Multnomah and State of Oregon, have invented certain new and useful Improvements in Chronometers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to chronometers and the primary object of the invention is to provide an improved chronometer of a minimum number of parts so arranged that the possibility of the device becoming broken is entirely eliminated.

Another object of the invention is to provide a weight operated chronometer, having an improved 'escapement whereby the keeping of accurate time is facilitated.

A still further object of the invention is to provide an improved chronometer of the above character, which is durable and efficient in use, one that is simple and easy to manufacture, and one that can be placed upon the market at a reasonable cost.

With these and other objects in view, the invention consists in the novel construction, arrangement and formation of parts, as will be hereinafter more specifically described,

claimed and illustrated in the accompanying drawings, forming a part thereof in which:

Figure l is a front elevation of the improved chronometer,

. Fig. 2 is a longitudinal vertical section through the same,

Fig. 3 is a transverse section through the same,

Fig. 4 is a longitudinal section taken on line 4.-'4 of Fig. 3, and

Fig. 5 is a detail View of the escapement mechanism.

Fig. 6 is a fragmentary sectional view of the same.

Referring to the drawings in detail, wherein similar reference characters designate corresponding parts throughout the several views, the numeral 1 generally indicates the improved chronometer, which includes the casing 2 having front and rear walls 3 and 4, side walls 5, and top and bottom walls 6 and 7.

Extending vertically in the casing is the standard 8 which extends centrally of the casing and adjacent to the front wall 3 Specification of Letters Patent.

Patented Oct. 2-5, 1921.

Serial No. 290,225.

thereof and has its terminals secured to the upper and lower walls 6 and 7. A shaft 9 has its terminals secured to the rear wall 4 and the supporting standard 8, and this shaft rotatably supports the disk 10 which has secured thereto a relatively small pulley wheel 11,. the purpose of which will hereinafter he more fully described. An internal ring gear 12 is secured to the outer face of the disk 10 adjacent to the edge thereof and this gear carries the hour dial 13, which is marked similar to. the ordinary clock in everyday use.

The support 8 has journaled therein an inwardly extending shaft 14 which has secured thereto the pinion 15 which meshes with the internal teeth of the ring gear 12. The pinion and the gear have a ratio of one to twelve so that when the hour dial makes one revolution, the pinion will have made twelve revolutions. This shaft 14 carries the dial 16, which is graduated to designate minutes and the supporting member 8 and the front wall 3 are provided with alined apertures so that the numbers on the dials l3 and 16 can be readily seen so as to determine the time of day. An endless cord 19 is wound once around the pulley l1. and is then extended over the pulley 20 which is secured to the upper wall 6. A horizontal casing 21 containing a suitable weight has secured adjacent each end thereof pulleys 22 around which the endless cord 19 extends, and the casing 21 divides the endless cord into two vertical runs 23 and 24.

A'weight 25 is slidably mounted upon the vertical run 23 and this weight is provided with a longitudinally extending slot 26 to receive the same. A cam 27 is pivotally mounted on each side of the slot 26 formed in the weight 25 and engages the cord 19, so as to prevent the weight from slipping down the same and the force of gravity acting on the weight tends to pull the vertical run 23 of the endless cord downward and owing to the fact that the cord is wound around the pulley 11, the dial 13 is slowly rotated as the weight descends.

To prevent the weight from descending too rapidly and to time the descent thereof an improved escapement device 30 is secured to the minute dial 16. The escapement device 30 includes an annular tubular member 31, having a plurality of equidistantly spaced semi-spherical partitions 32, the central portion of which is provided with relatively small outlet openings 33. This tube is adapted to contain a suitable liquid such as mercury. This tube is slightlymore than half filled with the mercury and the mercury is higher on one side of the tube than the other, as shown at 34, and the weight of this fluid tends to counteract the pulling movement of the weight 25, and as the fluid generally seeps through the small openings 33, the dial is allowed to slowly turn and the speed of rotation of the dials is controlled by the size of the openings in the partitions 32.

Acord 35 is secured to the cams 27 and this cord is extended over the pulley 36 V secured to the upper wall of the casing and the free end of the same extends outward of the casing, and when the weight has gravitated to the bottom of the device, the

free end of the cord 35 is pulled, which releases the cams from engagement with the cord 23 and the weight 25 is pulled to the 7 upper end of the same.

From the foregoing description, it can be seen that an improved clock is provided, which will keep absolutely accurate time and is constructed with a minimum number of parts.

The same arrangement of dials and pinions may be used in watches and the weight mechanism may be dispensed with and the ordinary spring andescapement substituted therefor.

changes in details-of construction proportion and arrangement of parts may be resorted to, when required without sacrificing any of the advantages of 'my invention as set forth. 7 i

hat I claim as new is:

A chronometer comprising an internally toothed hour dial, a pulley rotatable therewith, a minute dial having pinion engage ment with the toothed portion of the hour dial, a weighted cord engaging the said pulley, and movement controlling means comprising a tubular annulus of circular cross sectional outline containing mercury in its lower portion and subdivided by centrally perforated concavo-convex partitions facing in the same direction and spaced apart an equal distance. V

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM A. SLINGERLAND. V

Witnesses ORLO BALDWIN, PEYTON TAYLOR. 

